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Acrel ADW310 vs ABB B21 312-100

Install fit
Phase support Single-phase, 220 V measurement context. Single-phase, 230 V AC.
Installation Indoor distribution-box installation with an external split-core CT and AC 85-265 V auxiliary supply; qualified-electrician installation. Indoor 2-DIN-rail direct-connected meter for distribution boards; qualified-electrician installation.
Measurement Single-phase external-CT measurement of electrical parameters, harmonics, and forward/reverse active energy. Direct-connected single-phase active/reactive energy and electrical-parameter metering with separate import/export registers.
Max current 100 A 65 A
Meter fit
Accuracy class Class 1 active energy. MID Class B / IEC Class 1 active energy; reactive energy Class 2.
Current sensing External split-core CT; official manual lists matched 10 mm and 16 mm aperture options. Direct connected up to 65 A; no external current transformer required.
Monitoring
Protocol RS485 Modbus RTU / DL/T 645-07; optional Wi-Fi, 4G, and 470 MHz LoRa variants RS-485 Modbus RTU / EQ Bus / S0 pulse outputs
Local API Yes Yes
Cloud dependency No vendor cloud is required for the /C RS485 Modbus RTU variant; cloud or remote-service dependency varies with optional Wi-Fi, 4G, or LoRa system design. No vendor cloud required; measurements are read locally over RS-485 Modbus RTU, EQ Bus, S0 pulse, or the front display.
Home Assistant Yes Yes
Solar fit
Solar import/export Yes Yes
Buying context
Availability Global Acrel product and quote route; wireless-module availability and certifications vary by market. ABB global product and distributor channels; current Netherlands official channel listing verified, with regional stock and certifications varying.
Source check
Last verified Aug 5, 2026 Aug 11, 2026
Product page Official page Official page
Documentation Official docs Official docs
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